Agnostids


Systematics
Wikipedia
Images on Wikimedia Commons
Agnostids1 Agnostida is an extinct order of arthropods close to trilobites. Paleozoic group: found in the Cambrian and Ordovician periods. The name of the order comes from the word "unknowable" Agnostos234
Content
1 Description
2 Systematics
3 Geochronology
4 Notes
5 Literature
6 Links
Description edit | edit code
Small trilobites, usually only a few millimeters in length, the Thorax trunk section comprises from 2 in the Agnostina suborder up to 3 segments in some representatives of the suborder Eodiscina. Eyes of most species are absent. The convex part of the head shield, or glabella, is large, round in front The tail shield is rounded, isometric and almost equal to the head shield234
Acidiscus linedrawing
Marocconus notabilis
Tsunyidiscus niutitangensis
Pentagnostus brighamensis
Dicerodiscus linedrawing
Glyptagnostus reticulatus
Systematicsfix | edit code
A large and diverse group of trilobites of about 100 genera, divided into 2 suborders Agnostina, Eodiscina, they were previously recognized as two separate orders2567
Agnostina
Agnostoidea: Agnostidae, Ammagnostidae, Clavagnostidae, Diplagnostidae, Doryagnostidae, Glypt Metagnostidae, Peronopsidae, Ptychagnostidae
Condylopygoidea: Condylopygidae: Condylopyge / Paragnostus; Fallagnostus, Miraculaspis, Pleuroctenium = Dichagnostus - Eodiscina Eodiscoidea - Calodiscidae: Calodiscus / Goniodiscus; = Brevidiscus, Chelediscus, Korobovia, Neocobboldia / Cobboldia; = Margodiscus, Pseudocobboldia, Sinodiscus = Tologoja
Eodiscidae including Pagetiidae: Dawsonia = Aculeodiscus; = Metadiscus, Eodiscus = Spinodiscus; = Deltadiscus, Helepagetia, Kiskinella, Macannaia, Opsidiscus / Aulacodiscus, Pagetia = Eopagetia; = Mesopagetia, Pagetides = Discomesites, Sinopagetia
Hebediscidae: Delgadella = Alemtejoia; = Delgadodiscus; = Delgadoia; = Pagetiellus; = Pentagonalia, Dicerodiscus, Hebediscus, Luvsanodiscus, Natalina = Limbadiscus, Neopagetina / Pagetina, Parapagetia = Planodiscus, Tchernyshevioides
Tsunyidiscidae: Tsunyidiscus = Mianxiandiscus; Liangshandiscus; = Emeidiscus; = Hupeidiscus; = Shizhudiscus; = Guizhoudiscus
Weymouthiidae: Abakolia = Costadiscus, Acidiscus, Acrimetopus, Analox, Bathydiscus, Bolboparia, Cephalopyge, Cobboldites, Leptochilodiscus = Kerberodiscus, Litometopus, Mallagnostus = Ladadiscus; = Jinghediscus, Meniscuchus, Ninadiscus, Oodiscus, Runcinodiscus, Semadiscus, Serrodiscus = Paradiscus, Stingmadiscus, Tannudiscus, Weymouthia
Yukoniidae: Alaskadiscus, Egyngolia = Mongolodiscus, Ekwipagetia, Hebediscis; Hebediscis; = Zhenbadiscus, Lenadiscus, Yukonia, Yukonides
Geochronology edit code
The group appeared about 500 million years ago at the beginning of the Cambrian period and completely died out at the end of the Ordovician period 450 million years ago2 - Precambrian - Phanerozoic - Aeon - Paleozoic
Mesozoic
Cenozoic - Era - Cambrian - Ordo - Vic - Seal - ur - Devon - Carbon - Perm - Triassian - Jura
Mel
Paleo - gene - Neo - gene - P-d - 4570 - 541 - 485.4 - 443.4 - 419.2
358.9, 298.9, 252.2, 201.3, 145.0, 66.0, 23.03 and one million years

2,588
† Agnostida






Notes edit | edit the code
↑ Agnostids / E B Naimark // A - Questioning - M: Big Russian Encyclopedia, 2005 - C 186 - Big Russian Encyclopedia: in 35 t / hl ed S Osipov; 2004—, t 1 - ISBN 5-85270-329-X
↑ 1 2 3 4 SM Gon III ORDER AGNOSTIDA eng wwwtrilobitesinfo May 30, 2005 Reviewed February 9, 2014 ↑ 1 2 Drushchits VV Invertebrate paleontology - Moscow: Moscow State University Publishing House, 1974 - 528 s - 3,600 copies - ↑ 1 2 SM Gon III Pictorial guide to the order AGNOSTIDA December 7, 2006 Reviewed February 9, 2014
↑ Fortey, RA 2001 Trilobite systematics: the last 75 years J of Paleontology 756: 1141–1151
↑ Fortey, RA 1990 Ontogeny, hypostome attachment, and trilobite classification J of Paleontology 33: 529-576
↑ Cotton, TJ & amp; Fortey, RA 2005 "Comparative morphology and relationships of the Agnostida" In S Koenemann & amp; R A Jenner eds, Crustacea and Arthropod Relationships Volume, pp 95-136 Taylor and Francis Group
Literature edit code
Jell, P A & amp; J M Adrain 2003 Available generic names for trilobites // Memoirs of the Queensland Museum 482: 331–553
Links edit | edit code
Order Agnostida Salter 1864 English Paleobiology Database paleobiodborg Verified February 9, 2014
Trilobites
Taxonomy
Squads
Agnostida Asaphida Corynexochida Harpetida Nektaspida Redlichiida Lichida Phacopida Proetida Ptychopariida
Roda
List trilobite genera - Paleobiology - Cambrian explosion Cruziana Diplichnites Permian mass extinction Rusophycus Trilobite zone - Morphology
Exoskeleton
Tagmata
Cephalon Thorax Pigidium Axial lobe Pleural lobe
Terminology
Cranidium Effacement Enrollment Facial sutures Fixigena Gena Genal angle Glabella Gonatoparian Heteronomous Homonomous Hypostome Isopygous Librigena Macropygous Micropygous Opisthoparian Proparian Prosopon Spinosity Subisopygous - Soft body parts
Appendages Digestive tract Internal organs Musculature Antennae Eyes Sensory pits - Category: Trilobites


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